User`s guide

Calibration

Note: There are no user serviceable parts inside the

Universal Audio 1176LN. Unit calibration as well as repair

should only be performed only by qualified service

personnel. These calibration procedures are provided only

for use by qualified service technicians.

“Q” Bias

The compression threshold is set using R59. Under normal circumstances, this control does

not need to be adjusted. The threshold is dependent upon the specific characteristics of

the VVR FET (Q1), and it will be necessary to re-adjust it if Q1 is changed.

The following procedure is used to set “Q” bias:

Select either +4 or +8 output metering

Adjust R59 fully counterclockwise (CCW)

Apply a sine wave signal to the limiter

Use the Input and Output Controls for 0dB output

Slowly adjust R59 CW until the output decreases 1.0 dB

Meter Driver Null

A multimeter is needed to perform this calibration procedure.

Disconnect any input and output connection on the 1176LN

Set multimeter to measure dc volts

Depress the Meter GR pushbutton

Adjust “0” set potentiometer, R71 (located on the front panel) so that the meter

reads near 0 dB

Connect the multimeter across R74

Adjust R75 for a minimum voltage reading

Disconnect the multimeter

Readjust “0” set potentiometer, R71 so that the meter reads 0 dB

Zero Set

R71, located on the front panel is used to zero the meter. Adjust this potentiometer if the

meter needs to be recalibrated.

Stereo Interconnection

Using the 1176SA, two units may be connected for stereo operation. Use the following